Install the Facebook Pixel Helper Chrome extension. Visit your checkout page and click on the extension icon at the top of your browser to see whether the events firing or not.

Check Facebook account to see if events made it through. You can check your Facebook Ads account to confirm that events made it into your view. With very few exceptions (such as an incorrect Facebook pixel ID), events should be visible from the Events Manager.

More information on troubleshooting Facebook Pixel implementation is available through the Facebook